from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import get_object_or_404, render
from django.urls import reverse
from .models import Question, Choice

def index(request):
    latest_question_list = Question.objects.order_by('-pub_date')[:5]
    context = {'latest_question_list': latest_question_list}
    return render(request, 'polls/index.html', context)

def detail(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    return render(request, 'polls/detail.html', {'question': question})

def results(request, question_id):
    question = get_object_or_404(Question, pk=question_id)

    # 添加图表数据
    choices = [choice.choice_text for choice in question.choice_set.all()]
    votes = [choice.votes for choice in question.choice_set.all()]
    total_votes = sum(votes)

    context = {
        'question': question,
        'choices': choices,
        'votes': votes,
        'total_votes': total_votes,
        'max_votes': max(votes) if votes else 0,
        'user_count': total_votes  # 简单示例，实际需根据用户系统实现
    }
    return render(request, 'polls/results.html', context)

def vote(request, question_id):
    question = get_object_or_404(Question, pk=question_id)
    try:
        selected_choice = question.choice_set.get(pk=request.POST['choice'])
    except (KeyError, Choice.DoesNotExist):
        return render(request, 'polls/detail.html', {
            'question': question,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        return HttpResponseRedirect(reverse('polls:results', args=(question.id,)))
